Improvement in laying asphalfc or concrete pavements or roads



i am sate mm (attire;

EDWARD JOSEPH DE s nnn-or NEW YORK, N. Y., ASSIGNOR TO NEW YORK IMPROVED ANTHRAGITE GOAL COMPANY, or SAME PLACE.

Letters Patent No. 103,581, dated May 31, 1870.

IMPROVEMENT IN LAYING- ASPHALEI' OR CONCRETE PAVEMENTS OR ROADS The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern:

Be it known that I, EDWARD J OSEPH DE SMEDT,

of the city, county, and State of New York, have inventeda new and useful Improvement in Laying Asi phalt or Concrete Pavements and Roads, designed to chine, without heating the asphalt to a degree that seriously impairs its virtue for paving purposes.v

My invention'is designed to overcome this difficulty, and, to that end, I first mix the asphalt,.one part of the latter with about-five parts of sand.

iThese substances can be well mixed and incorporated together in the proportions last named, under a comparatively moderate degree of heat, which will not in theleast impair the character of the asphalt for paving purposes. v

The surface on which the road or pavement is to be laid is properly graded, and I first put a thin. layer of hot sand upon it, about half an inch in thickness, and upon this layer of sand I put a layer of hot sand and asphalt, that which was previously mixed, this lastlayer being about one inch in thickness.

Over this layer of 1 sand and asphalt I pass a hot roller, and theu'apply a thin layer of hot sand, halfan inch thick, and over the latter a layer, an inch'thick,'

oft-he hot asphalt and sand, which is rolled with ahot roller, as before.

This is repeated until the desired thickness for the road or pavement is obtained.

By this process or mode of laying I obtain in the road or pavement the proper proportions of sand and asphalt without any diificulty whatever, and insure the proper or thdrongh incorporation of the sand-grind asphalt, and sand layers, so that a liomogeneoit is obtained throughout.

In carrying out this invention, it is importantto observe that the asphalt used should be of that kind which will fuse at a moderate degree of heat,say, about 170 Fahrenheit, and if a harder and les's'tusible asphalt be used, it must be incorporated with a substance that will soften it or allow it to fuse at a lower temperature.

For this purpose, Iadd to a hard asphalt a product of the distillation'ot' asphalt-s orpetrol'cum voils, the heavy oils termed the parafiine series, and also where the smell is not objectionable, the residuum of the distillation of petroleum oils, but Iiprefer to all those above-named oils the heavy crude petroleum oils, of

a gravity not higher than 40 Bauin, at 60 Fahrenheit.

Having thus described myinvention, What I claim as new, and desire to secure by Letters Patent, is-

' The laying or forming of asphalt or concrete roads and pavements by means of alternate layers of sand, and asphalt and sand mixed, and treated or operated upon in the manner substantially as set forth.

Witnesses: E. J. DE SMEDT.

THEO. Tuscrr, A R. HAIGHT. 

